How to Give Your Whole Mac Dock a New Icon Pack in One Step
Download the icons you want (for example from macosicons.com) into one folder of PNG or .icns files. In Moor, open Settings → Icons, choose Import Icon Pack… and pick that folder. Moor matches each picture to an app by name or bundle ID, ignores extra words in the file names, and tells you how many it matched. Reset All in Settings → Icons removes every custom icon at once.